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/*
 *
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 *
 * Copyright (c) 2000 World Wide Web Consortium,
 * (Massachusetts Institute of Technology, Institut National de
 * Recherche en Informatique et en Automatique, Keio University). All
 * Rights Reserved. This program is distributed under the W3C's Software
 * Intellectual Property License. This program is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE.
 * See W3C License http://www.w3.org/Consortium/Legal/ for more details.
 */

package org.w3c.dom.css;

import org.w3c.dom.DOMException;

/**
 * The <code>CSSRule</code> interface is the abstract base interface for any type of CSS statement.
 * This includes both rule sets and at-rules. An implementation is expected to preserve all rules
 * specified in a CSS style sheet, even if the rule is not recognized by the parser. Unrecognized
 * rules are represented using the <code>CSSUnknownRule</code> interface. <p>See also the <a
 * href='http://www.w3.org/TR/2000/REC-DOM-Level-2-Style-20001113'>Document Object Model (DOM) Level
 * 2 Style Specification</a>.
 *
 * @since DOM Level 2
 */
public interface CSSRule {
  // RuleType
  /**
   * The rule is a <code>CSSUnknownRule</code>.
   */
  public static final short UNKNOWN_RULE = 0;
  /**
   * The rule is a <code>CSSStyleRule</code>.
   */
  public static final short STYLE_RULE = 1;
  /**
   * The rule is a <code>CSSCharsetRule</code>.
   */
  public static final short CHARSET_RULE = 2;
  /**
   * The rule is a <code>CSSImportRule</code>.
   */
  public static final short IMPORT_RULE = 3;
  /**
   * The rule is a <code>CSSMediaRule</code>.
   */
  public static final short MEDIA_RULE = 4;
  /**
   * The rule is a <code>CSSFontFaceRule</code>.
   */
  public static final short FONT_FACE_RULE = 5;
  /**
   * The rule is a <code>CSSPageRule</code>.
   */
  public static final short PAGE_RULE = 6;

  /**
   * The type of the rule, as defined above. The expectation is that
   * binding-specific casting methods can be used to cast down from an
   * instance of the <code>CSSRule</code> interface to the specific
   * derived interface implied by the <code>type</code>.
   */
  public short getType();

  /**
   * The parsable textual representation of the rule. This reflects the
   * current state of the rule and not its initial value.
   */
  public String getCssText();

  /**
   * The parsable textual representation of the rule. This reflects the
   * current state of the rule and not its initial value.
   *
   * @throws DOMException SYNTAX_ERR: Raised if the specified CSS string value has a syntax error
   * and is unparsable. <br>INVALID_MODIFICATION_ERR: Raised if the specified CSS string value
   * represents a different type of rule than the current one. <br>HIERARCHY_REQUEST_ERR: Raised if
   * the rule cannot be inserted at this point in the style sheet. <br>NO_MODIFICATION_ALLOWED_ERR:
   * Raised if the rule is readonly.
   */
  public void setCssText(String cssText)
      throws DOMException;

  /**
   * The style sheet that contains this rule.
   */
  public CSSStyleSheet getParentStyleSheet();

  /**
   * If this rule is contained inside another rule (e.g. a style rule
   * inside an @media block), this is the containing rule. If this rule is
   * not nested inside any other rules, this returns <code>null</code>.
   */
  public CSSRule getParentRule();

}
